remove broken variant "deleted" scope
remove broken variant "deleted" scope

this "deleted" scope doesn't remove the default "deleted_at: nil" condition so it just produces a query like this:

```sql
SELECT "spree_variants".*
FROM "spree_variants"
WHERE "spree_variants"."deleted_at" IS NULL
AND   "spree_variants"."deleted_at" IS NOT NULL
```

instead you have to use the "only_deleted" scope from the acts_as_paranoid gem
see https://github.com/goncalossilva/acts_as_paranoid/blob/ae0fe74/README.markdown#filtering

example: https://github.com/spree/spree/pull/4562

Fixes #4601

tancnle/spree,Mayvenn/spree,raow/spree,reidblomquist/spree,abhishekjain16/spree,gregoryrikson/spree-sample,SadTreeFriends/spree,yushine/spree,RatioClothing/spree,StemboltHQ/spree,sfcgeorge/spree,archSeer/spree,tailic/spree,lsirivong/spree,alejandromangione/spree,gautamsawhney/spree,vulk/spree,archSeer/spree,zaeznet/spree,sunny2601/spree,ayb/spree,adaddeo/spree,AgilTec/spree,TimurTarasenko/spree,firman/spree,jaspreet21anand/spree,camelmasa/spree,PhoenixTeam/spree_phoenix,piousbox/spree,priyank-gupta/spree,Engeltj/spree,net2b/spree,sliaquat/spree,carlesjove/spree,jordan-brough/solidus,vinsol/spree,athal7/solidus,athal7/solidus,brchristian/spree,calvinl/spree,rakibulislam/spree,vcavallo/spree,caiqinghua/spree,Lostmyname/spree,assembledbrands/spree,quentinuys/spree,reidblomquist/spree,delphsoft/spree-store-ballchair,thogg4/spree,cutefrank/spree,ahmetabdi/spree,edgward/spree,alejandromangione/spree,KMikhaylovCTG/spree,KMikhaylovCTG/spree,lsirivong/solidus,reinaris/spree,Hawaiideveloper/shoppingcart,volpejoaquin/spree,mleglise/spree,vulk/spree,zaeznet/spree,zaeznet/spree,ujai/spree,volpejoaquin/spree,FadliKun/spree,nooysters/spree,jsurdilla/solidus,sliaquat/spree,progsri/spree,welitonfreitas/spree,omarsar/spree,Migweld/spree,quentinuys/spree,jordan-brough/solidus,berkes/spree,JDutil/spree,joanblake/spree,priyank-gupta/spree,pervino/solidus,rajeevriitm/spree,softr8/spree,omarsar/spree,Hawaiideveloper/shoppingcart,mindvolt/spree,Ropeney/spree,azclick/spree,TrialGuides/spree,project-eutopia/spree,freerunningtech/spree,DynamoMTL/spree,ujai/spree,moneyspyder/spree,groundctrl/spree,yiqing95/spree,shaywood2/spree,pervino/spree,derekluo/spree,CJMrozek/spree,project-eutopia/spree,gregoryrikson/spree-sample,vmatekole/spree,scottcrawford03/solidus,builtbybuffalo/spree,siddharth28/spree,vinayvinsol/spree,miyazawatomoka/spree,jspizziri/spree,tomash/spree,woboinc/spree,sunny2601/spree,richardnuno/solidus,project-eutopia/spree,Ropeney/spree,joanblake/spree,zaeznet/spree,APohio/spree,trigrass2/spree,welitonfreitas/spree,zamiang/spree,gautamsawhney/spree,robodisco/spree,TrialGuides/spree,tancnle/spree,kewaunited/spree,archSeer/spree,freerunningtech/spree,jeffboulet/spree,NerdsvilleCEO/spree,karlitxo/spree,sfcgeorge/spree,alejandromangione/spree,tesserakt/clean_spree,rbngzlv/spree,yushine/spree,dandanwei/spree,bonobos/solidus,watg/spree,grzlus/spree,useiichi/spree,sfcgeorge/spree,jasonfb/spree,alvinjean/spree,caiqinghua/spree,shekibobo/spree,miyazawatomoka/spree,ramkumar-kr/spree,yomishra/pce,useiichi/spree,imella/spree,patdec/spree,jimblesm/spree,FadliKun/spree,bonobos/solidus,beni55/spree,Hawaiideveloper/shoppingcart,sunny2601/spree,imella/spree,welitonfreitas/spree,jparr/spree,TrialGuides/spree,azclick/spree,bonobos/solidus,Mayvenn/spree,patdec/spree,njerrywerry/spree,Ropeney/spree,trigrass2/spree,DarkoP/spree,TimurTarasenko/spree,Machpowersystems/spree_mach,rbngzlv/spree,ckk-scratch/solidus,calvinl/spree,lyzxsc/spree,Lostmyname/spree,JDutil/spree,locomotivapro/spree,mindvolt/spree,xuewenfei/solidus,richardnuno/solidus,APohio/spree,lsirivong/spree,firman/spree,dotandbo/spree,mindvolt/spree,shaywood2/spree,DarkoP/spree,rbngzlv/spree,Kagetsuki/spree,berkes/spree,shekibobo/spree,richardnuno/solidus,DynamoMTL/spree,yomishra/pce,carlesjove/spree,hifly/spree,tomash/spree,lyzxsc/spree,DynamoMTL/spree,Senjai/solidus,pervino/solidus,hoanghiep90/spree,jspizziri/spree,CiscoCloud/spree,athal7/solidus,berkes/spree,radarseesradar/spree,welitonfreitas/spree,sfcgeorge/spree,rakibulislam/spree,siddharth28/spree,tesserakt/clean_spree,TimurTarasenko/spree,TrialGuides/spree,camelmasa/spree,abhishekjain16/spree,Senjai/solidus,reinaris/spree,jeffboulet/spree,dafontaine/spree,rajeevriitm/spree,reinaris/spree,pervino/spree,raow/spree,jaspreet21anand/spree,imella/spree,cutefrank/spree,StemboltHQ/spree,ckk-scratch/solidus,sideci-sample/sideci-sample-spree,AgilTec/spree,karlitxo/spree,tesserakt/clean_spree,mleglise/spree,patdec/spree,fahidnasir/spree,sliaquat/spree,omarsar/spree,grzlus/solidus,hoanghiep90/spree,Kagetsuki/spree,LBRapid/spree,vmatekole/spree,zamiang/spree,richardnuno/solidus,shekibobo/spree,ujai/spree,tailic/spree,maybii/spree,bricesanchez/spree,odk211/spree,shekibobo/spree,abhishekjain16/spree,beni55/spree,progsri/spree,woboinc/spree,pervino/spree,Arpsara/solidus,mleglise/spree,nooysters/spree,hoanghiep90/spree,devilcoders/solidus,abhishekjain16/spree,jspizziri/spree,berkes/spree,SadTreeFriends/spree,jsurdilla/solidus,alvinjean/spree,pervino/solidus,yiqing95/spree,pulkit21/spree,Arpsara/solidus,grzlus/spree,athal7/solidus,forkata/solidus,brchristian/spree,NerdsvilleCEO/spree,jsurdilla/solidus,Arpsara/solidus,vinsol/spree,tancnle/spree,ayb/spree,madetech/spree,siddharth28/spree,reidblomquist/spree,reinaris/spree,jsurdilla/solidus,piousbox/spree,joanblake/spree,brchristian/spree,rakibulislam/spree,CJMrozek/spree,robodisco/spree,rakibulislam/spree,net2b/spree,alejandromangione/spree,ayb/spree,odk211/spree,vulk/spree,Engeltj/spree,ahmetabdi/spree,azranel/spree,rajeevriitm/spree,lyzxsc/spree,robodisco/spree,robodisco/spree,madetech/spree,njerrywerry/spree,azranel/spree,jimblesm/spree,ramkumar-kr/spree,siddharth28/spree,vinayvinsol/spree,tailic/spree,Boomkat/spree,SadTreeFriends/spree,degica/spree,wolfieorama/spree,RatioClothing/spree,Ropeney/spree,surfdome/spree,FadliKun/spree,derekluo/spree,yushine/spree,net2b/spree,joanblake/spree,builtbybuffalo/spree,locomotivapro/spree,thogg4/spree,PhoenixTeam/spree_phoenix,Migweld/spree,kewaunited/spree,APohio/spree,alvinjean/spree,cutefrank/spree,degica/spree,softr8/spree,zamiang/spree,forkata/solidus,lsirivong/solidus,gautamsawhney/spree,Mayvenn/spree,piousbox/spree,forkata/solidus,JuandGirald/spree,orenf/spree,DarkoP/spree,azclick/spree,NerdsvilleCEO/spree,ayb/spree,karlitxo/spree,dafontaine/spree,carlesjove/spree,Machpowersystems/spree_mach,thogg4/spree,builtbybuffalo/spree,JuandGirald/spree,project-eutopia/spree,useiichi/spree,tomash/spree,keatonrow/spree,grzlus/spree,dotandbo/spree,CJMrozek/spree,orenf/spree,omarsar/spree,CiscoCloud/spree,grzlus/solidus,camelmasa/spree,vinayvinsol/spree,miyazawatomoka/spree,zamiang/spree,volpejoaquin/spree,thogg4/spree,shaywood2/spree,dotandbo/spree,maybii/spree,caiqinghua/spree,progsri/spree,Senjai/solidus,radarseesradar/spree,locomotivapro/spree,agient/agientstorefront,lsirivong/solidus,jparr/spree,Kagetsuki/spree,softr8/spree,edgward/spree,AgilTec/spree,moneyspyder/spree,odk211/spree,ahmetabdi/spree,derekluo/spree,raow/spree,delphsoft/spree-store-ballchair,yiqing95/spree,pervino/solidus,bricesanchez/spree,trigrass2/spree,azclick/spree,beni55/spree,softr8/spree,delphsoft/spree-store-ballchair,Senjai/solidus,Engeltj/spree,maybii/spree,raow/spree,calvinl/spree,priyank-gupta/spree,watg/spree,fahidnasir/spree,Lostmyname/spree,Machpowersystems/spree_mach,patdec/spree,jordan-brough/solidus,sliaquat/spree,shaywood2/spree,yiqing95/spree,KMikhaylovCTG/spree,quentinuys/spree,carlesjove/spree,pervino/spree,NerdsvilleCEO/spree,jasonfb/spree,agient/agientstorefront,groundctrl/spree,kewaunited/spree,dandanwei/spree,pulkit21/spree,pulkit21/spree,odk211/spree,brchristian/spree,jasonfb/spree,hifly/spree,radarseesradar/spree,beni55/spree,moneyspyder/spree,DarkoP/spree,woboinc/spree,volpejoaquin/spree,groundctrl/spree,degica/spree,RatioClothing/spree,ckk-scratch/solidus,SadTreeFriends/spree,tesserakt/clean_spree,wolfieorama/spree,keatonrow/spree,sideci-sample/sideci-sample-spree,gregoryrikson/spree-sample,assembledbrands/spree,agient/agientstorefront,fahidnasir/spree,rajeevriitm/spree,priyank-gupta/spree,jspizziri/spree,radarseesradar/spree,devilcoders/solidus,jparr/spree,grzlus/solidus,jimblesm/spree,jeffboulet/spree,xuewenfei/solidus,StemboltHQ/spree,LBRapid/spree,dotandbo/spree,trigrass2/spree,watg/spree,nooysters/spree,yomishra/pce,Migweld/spree,hifly/spree,delphsoft/spree-store-ballchair,xuewenfei/solidus,KMikhaylovCTG/spree,CiscoCloud/spree,reidblomquist/spree,ramkumar-kr/spree,sunny2601/spree,Hawaiideveloper/shoppingcart,karlitxo/spree,devilcoders/solidus,forkata/solidus,Arpsara/solidus,tancnle/spree,jimblesm/spree,vmatekole/spree,kewaunited/spree,njerrywerry/spree,CJMrozek/spree,bonobos/solidus,hoanghiep90/spree,PhoenixTeam/spree_phoenix,grzlus/solidus,firman/spree,jaspreet21anand/spree,ahmetabdi/spree,vcavallo/spree,vinayvinsol/spree,pulkit21/spree,cutefrank/spree,jasonfb/spree,madetech/spree,derekluo/spree,scottcrawford03/solidus,keatonrow/spree,njerrywerry/spree,miyazawatomoka/spree,gregoryrikson/spree-sample,fahidnasir/spree,devilcoders/solidus,rbngzlv/spree,edgward/spree,wolfieorama/spree,orenf/spree,calvinl/spree,jparr/spree,lsirivong/spree,quentinuys/spree,tomash/spree,groundctrl/spree,alvinjean/spree,jordan-brough/solidus,adaddeo/spree,dandanwei/spree,mleglise/spree,vinsol/spree,mindvolt/spree,archSeer/spree,JDutil/spree,Boomkat/spree,locomotivapro/spree,surfdome/spree,JDutil/spree,nooysters/spree,azranel/spree,adaddeo/spree,wolfieorama/spree,Kagetsuki/spree,sideci-sample/sideci-sample-spree,lyzxsc/spree,bricesanchez/spree,vmatekole/spree,jaspreet21anand/spree,JuandGirald/spree,AgilTec/spree,ramkumar-kr/spree,useiichi/spree,vcavallo/spree,Boomkat/spree,TimurTarasenko/spree,Engeltj/spree,adaddeo/spree,maybii/spree,JuandGirald/spree,keatonrow/spree,vcavallo/spree,assembledbrands/spree,surfdome/spree,hifly/spree,camelmasa/spree,progsri/spree,yushine/spree,xuewenfei/solidus,PhoenixTeam/spree_phoenix,builtbybuffalo/spree,Mayvenn/spree,net2b/spree,dafontaine/spree,vinsol/spree,DynamoMTL/spree,caiqinghua/spree,scottcrawford03/solidus,lsirivong/solidus,ckk-scratch/solidus,vulk/spree,azranel/spree,CiscoCloud/spree,gautamsawhney/spree,surfdome/spree,dandanwei/spree,firman/spree,agient/agientstorefront,APohio/spree,scottcrawford03/solidus,Lostmyname/spree,LBRapid/spree,jeffboulet/spree,grzlus/spree,lsirivong/spree,Migweld/spree,FadliKun/spree,dafontaine/spree,freerunningtech/spree,orenf/spree,madetech/spree,piousbox/spree,Boomkat/spree,moneyspyder/spree,edgward/spree